Apparatus and method for requesting password re-entry for external-device display and not requesting password re-entry for image display on display unit of the apparatus

Abstract

The image forming apparatus decodes a two dimensional code within an image and obtains a password; stores the image in a storage unit if the password thus obtained matches a password entered through an operating section; and when an instruction is given by a user to display the image stored in the storage unit on a display unit of the image forming apparatus, displays the image on the display unit of the image forming apparatus without requesting an entry of the obtained password, and when an instruction is given by a user to display the image stored in the storage unit on a display unit of an external device, other than the display unit of the image forming apparatus, requests re-entry of the password for displaying the image on the display unit of the external device.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an image forming apparatus capable of handling a two dimensional code, a control method thereof, and a storage medium therefor.[0003]2. Description of the Related Art[0004]A technology (as disclosed in, for example, Japanese Patent Laid-Open No. 2003-280469) of restricting a copy of printed material by using a two dimensional code has heretofore been known. In this conventional technology, the following processing is performed.[0005](1) First, a password is encoded so that a two dimensional code is obtained, and printed material on which the obtained two dimensional code is printed is scanned by a scanner of an image forming apparatus.[0006](2) Next, if the two dimensional code is detected in image data obtained by the scanning, the two dimensional code is decoded so that the password is obtained.[0007](3) Thereafter, a user of the image forming apparatus is requested to input a password...

AI Technical Summary

Benefits of technology

[0018]In accordance with the invention, the image forming apparatus which restricts an unauthorized copy of a printed material with a two dimensional code printed thereon can restrict copying at the time when an image is formed from image data obtained by scanning the printed material or at the time when the stored image data are browsed on an external device. Therefore, restraining performance to an unauthorized copy of an important document can be improved.

Problems solved by technology

However, a copy cannot necessarily be prevented from being stored in the following case.

In such an image forming apparatus, when the image data stored in the storage device are transmitted to an external device by file transfer or by fax, there is a problem that a copy can be made with use of printing means on the side of the external device.

Further, when browsing image data of an image forming apparatus using a display function of the image forming apparatus, there is no problem; however, when browsing image data of the image forming apparatus using an external device, there is a problem where a copy can be made using screenshot means and printing means of the external device.

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